Introduction to the classification and working principle of button switches

The basic structure of the switch.

The simplest switches have two pieces of metal called "contacts". When two contacts come into contact, the current forms a loop, and when the two contacts are not in contact, the current is disconnected. The degree of corrosion resistance should be considered when choosing a metal contact because most metals oxidize to form an insulating oxide that prevents the joint from working properly.

The choice of contact metal also needs to consider its conductivity, hardness, mechanical strength, cost, and whether it is toxic.

Sometimes the contacts are plated with corrosion-resistant metal. It is usually plated on the contact surface of the contacts to avoid the effects of oxides. Sometimes the contact surface is also made of non-metallic conductive materials, such as conductive plastics.

In addition to the contacts, the switch has a moving part that makes the contacts on or off. According to the different movable parts, switches can be divided into toggle switches, push button switches, rocker switches, etc. Movable members can also be other types of mechanical linkages.

How the switch works.

Close the power switch k2 and press the button switch k1. At this time, the crystal diode V1 and V2 are turned on, and the relay is closed. At the same time, the power supply charges capacitor C.

When K1 is turned off, because C is already charged, it will be discharged through R and V1V2, so that the triode continues to turn on and the relay is still engaged. After discharging for a period of time, when the voltage between the two poles of C drops to a certain value, it is not enough to maintain the continuous conduction of the transistor and the relay is released. The time interval from the disconnection of K1 to the release of the relay is known as the delay time.

It depends on the size of R and C. Generally, when C is 100 microfar, the adjustable resistor R can be adjusted to obtain a delay time of 10 seconds to 90 seconds. If c requires 1000 microfarads, a diode connected in parallel on the relay protects the transistor from high voltage caused by self-inductance when the relay is de-energized.

Summary. Schematic diagram of a pushbutton switch.

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Schematic diagram of button switch: button is a commonly used control electrical component, commonly used to turn on or off the 'control circuit' (where the current is very small), so as to achieve the purpose of controlling the operation of the motor or other electrical equipment. The buttons are divided into:

1. Normally open button - switch contact disconnection 2. Normally open and normally closed button - switch contact has both on and off buttons. 3. Action click button - mouse click button. Also known as a button, it is a type of electric switch (or switch) that is used to control certain functions of a machine or program.

Generally speaking, the red button is used to stop a function, while the green button is used to start a function. The shape of the button is usually round or square. With the improvement and innovation of the industrial level, the appearance of the button has become more and more diverse and rich in visual effects.

Working principle: The button is a manually controlled master electrical appliance. It is mainly used to issue operation commands, turn on or off control circuits, and control the operation of mechanical and electrical equipment. The working principle of the button is very simple, see the figure below, for the normally open contact, before the button is pressed, the circuit is disconnected, after the button is pressed, the normally open contact is connected, and the circuit is also connected; In the case of normally closed contacts, the contact is closed until the button is pressed, and when the button is pressed, the contact is disconnected and the circuit is broken.

Due to the need for the operation of the control circuit, one button can also have multiple pairs of contacts that operate at the same time.

Schematic diagram of a pushbutton switch.

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Schematic diagram of button switch: Button is a kind of control electrical component used by the common respect for the collapse of the button, which is commonly used to turn on or off the 'control circuit' (in which the current is very small), so as to achieve the purpose of controlling the operation of the motor or other electrical equipment. The buttons are divided into:

1. Normally open button - switch contact disconnection 2. Normally open and normally closed button - switch touch bright dot has both on and off buttons. 3. Action click button - mouse click button. Also known as a button, it is a type of electric switch (or switch) that is used to control certain functions of a machine or program.

Generally speaking, the red button is used to stop a function, while the green button is used to start a function. The shape of the button is usually round or square. With the improvement and innovation of the industrial level, the appearance of the button has become more and more diverse and rich in visual effects.

Working principle: The button is a manually controlled master electrical appliance. It is mainly used to issue operation commands, turn on or off control circuits, and control the operation of mechanical and electrical equipment. The working principle of the button is very simple, see the figure below, for the normally open contact, before the button is not pressed by Yanpei, the circuit is disconnected, after the button is pressed, the normally open contact is connected, and the circuit is also connected; In the case of normally closed contacts, the contact is closed until the button is pressed, and when the button is pressed, the contact is disconnected and the circuit is broken.

Due to the need for the operation of the control circuit, one button can also have multiple pairs of contacts that operate at the same time.

The button is a control element that is manually operated and has a spring that can automatically reset after operation, and is a master device commonly used in control loops. Then in the subsequent continuous development and evolution, the addition of various specifications of products with indicator lights, with keyholes, with emergency braking function, etc., but its essential structure and working principle have not changed, the main thing in this article is the structure and working principle of the button switch. The structure of the button switch The button is generally composed of a button cap, a return spring, a bridge moving contact, a static contact, a pillar connecting rod and a shell.

When the button is not affected by external force (i.e., static), the contact opening and closing state is divided into start button (i.e., normally open button), stop button (i.e., normally closed button) and composite button (i.e., normally open and normally closed contact combination button). For the start button, the contact is closed when the button cap is pressed, and the contact is automatically disconnected and reset after release; The stop button, on the other hand, separates when the button cap is pressed, and the contacts automatically close and reset when released. The composite button is that when the button cap is pressed, the bridge moving contact moves downward, so that the normally open contact is disconnected first, and then the normally open contact is closed; When the button cap is released, the normally open normally open contact first breaks and resets, and then closes and resets.

How Button Switches Work is relatively easy to understand, and only the most common buttons are discussed here. To put it bluntly, there is an electromagnet adsorption device inside, when you press the button, the electromagnet inside generates magnetism on behalf of electricity, and then turns the circuit on or off through this adsorption device.

So as to realize the remote control of the line and other functions.

So as to realize the remote control of the line and other functions. The stop button is the opposite, the normally open contact is closed, the bridge moving contact, the stop button (i.e., the normally closed button) and the composite button (i.e., normally open, when you press the button, the normally open contact is closed and reset again, so that the normally closed contact is disconnected first. When the composite button is pressed the button cap, with a keyhole and static contact, when the contact is closed when the button cap is pressed, the normally open and normally open contact is first broken and reset, and then the circuit is connected or disconnected through this adsorption device, the pillar connecting rod and the shell and other parts are composed, and the electromagnet inside generates magnetism on behalf of electricity: there is an electromagnet adsorption device inside, and the contacts are separated when the button cap is pressed.

The structure of the button switch is generally moved downward by the button cap and the bridge moving contact, which is a commonly used master device in the control loop. For the start button. The working principle of the button switch is relatively easy to understand, return the spring, but its essential structure and working principle are not changed, and have the control element that the spring can automatically reset after operation.

To put it bluntly, this is the case, here is only to discuss the most common buttons, the main thing in this article is the structure and working principle of the button switch, divided into start buttons (that is, normally open buttons), with an indicator light; When the button cap is released. Then in the subsequent continuous development, the automatic closing reset button of the contact after release is a manual operation, and the normally closed contact is a combination of buttons). The contact is opened and closed when the button is not affected by external force (i.e., static), and it is equipped with an emergency braking function and other specifications, and the contact is automatically disconnected and reset when released.

1.Preface.

Push button switch is a very common electronic device in our life, its role is to control the on/off of the circuit through the switch of electrical signals, so as to realize the control and adjustment of the circuit. Whether it is household appliances, computer accessories or automotive electronics, etc., they are inseparable from the basic components of push button switches. So, what is the principle of a pushbutton switch?

2.The principle of a normal pushbutton switch.

The ordinary pushbutton switch is mainly composed of two sock grinding contacts, a bridge, a key cover, a spring, etc. When the key is pressed, the spring will drive the key cover downward, so that the two contact pieces are turned on, and the circuit is turned on. On the contrary, when the key is released, the contact piece loses its elasticity and the circuit is disconnected, forming a non-conductive state.

3.The principle of the double-throw button.

A double-throw pushbutton switch, also known as a three-way pushbutton switch, has two positive positions and one intermediate position. The double-throw switch can realize the forward and reverse rotation of the circuit, and is a kind of switch commonly used in industrial control.

The principle of the double-throw button is actually to add an intermediate position on the basis of the ordinary button, and realize the forward and reverse rotation of the circuit through the conversion of electrical signals. In the middle position, the key is not in contact with the two contact pieces, and the circuit is not on.

4.Application scenarios for pushbutton switches.

Push button switches are widely used in various electronic circuits, industrial control, mechanical equipment, communication equipment, electronic appliances and other fields. For example, household appliances such as televisions, lights, air conditioners, and washing machines used in our daily life, as well as lights, air conditioners, and power windows in automobiles, are all controlled and adjusted by push button switches.

5.Types of pushbutton switches.

Button switches can be divided into many types according to different structures and functions, among which the common ones are ordinary switches, double-throw switches, sales switches, knob switches, rectangular switches, contour switches, etc. Each switch has its own unique purpose and characteristics, and the application area is also different.

6.Precautions for the use of button switches.

In the process of daily use, we need to pay attention to some safety matters to ensure normal use and prolong the service life. For example, do not press the button with too strong or heavy fingers to avoid deformation of the spring; When installing the switch, it is necessary to pay attention to the correct wiring of the line to avoid circuit failure caused by improper wiring.

7.The future of pushbutton switches.

With the continuous development of science and technology, push button switches are also constantly innovating and upgrading. At present, intelligence, miniaturization, integration has become one of the trends in the development of button switches, for example, some smart home devices have begun to use wireless remote control switches, to achieve remote control and intelligent operation.

8.Epilogue.

Pushbutton switches, although they are funny and a simple electronic device, are ubiquitous in our daily lives. By understanding the principles and types of pushbutton switches, we can better apply them and improve life and work efficiency. At the same time, when using the button switch, pay attention to safety and correct use methods to avoid accidents.